[hpsdr] It lives - but....

[joetorrey at cablelynx.com]

> ***** High Performance Software Defined Radio Discussion List *****
Paul,
I had this issue with powered speakers out of the janus / ozy setup. I
added circuitry and software that grounds the input to the powered
speakers when I transmit; also for a "monitor" output I installed another
stereo plug that does not mute that I use for transmit audio monitoring
when needed. You might try a different headphone set as I suspect that my
primary issue was the particular speaker set as well; I went through the
same as you with the chokes and such.

Joe
WD5Y


>
> Got my HPSDR transceiver on air this evening with the 100W PA, all
> generally
> fine with some good audio reports. However, I am getting RF feedback in
> the
> headphones (not on the transmitted signal) and wondered if anyone else has
> experienced this? I get nothing when using a dummy load but get feedback
> when using a well matched antenna (and there is nothing coming up the
> outside of the coax either - it's well choked and I've had a clamp on RF
> ammeter on it as well).
>
> I'm thinking grounding issue (only think connected to Mercury is the
> headphones and the coax).
>
> Suggestions welcome as always.
>
> Paul M1PAF
>
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